Why my S6 doesn't ask me for the decrypt password when switching on?

I turned on the Encrypt option on my Android Samsung Galaxy S6. The first time I switched in it asked me for the encrypted password to decrypt all the files. But since the S6 was updated it doesn't ask me for the decrypt password, it only starts and goes to the unlock screen as a normal Android.

Is it normal? Does it have to ask me for the password or does the S6 have a secure memory like Knox where it saves the decrypt password and that's why it doesn't ask me for it now?